69results about "Signal transmission/receiving via power distribution" patented technology

An apparatus is provided for high frequency multiplexed electrical line communication for cable TV, telephone, internet, security and other control applications over the mid and low voltage power lines and directly through the transformers. The apparatus includes a transmitter, a receiver, a modem, a multiplexer and multiple couplers at each of two or more locations along an electrical line. The couplers have capacitive circuits serially connected with an air-core or dielectric-core transformer. The capacitive circuits resonate with the transformer at a preselected frequency. The coupler eliminates noise and is matched to the characteristic impedance of the line at the preselected frequency, which linearizes communication on the line and allows high speed data and voice communication over long distances. Multiple modulators and demodulators are used to produce multiple modulated carrier frequencies.

Low-cost intelligent control and communication devices are arranged to communicate with one another over one or more shared physical media, such as a powerline or a radio frequency band. No network controller is needed, because any device can act as a master, slave, or repeater. Adding more devices makes the system more robust, by virtue of a simple protocol for communication retransmissions and retries.

Data signals are communicated between a power line and a computer, wherein the power line provides power to the computer via a distribution transformer and the computer is in communication with a wireless communication path. A first data signal is communicated with the power line. A conversion is made between the first data signal and a second data signal capable of being communicated wirelessly. The second data signal is wirelessly communicated with the wireless communication path.

Methods and systems for injecting information into a power signal, and techniques to capture the injected information are disclosed. Various processes for using the information are also presented, which may relate to the type of device receiving the information. Moreover, techniques for determining the distance of a consumer device are disclosed, as have a specific implementation which relates to mobile consumer devices. Also various ways of encrypting both in-band and out-of-band transmission are disclosed.

A method for communication over a network of power lines (34), including establishing a communication link within a selected frequency band over the network between a first transceiver (32B) coupled to the network and a second transceiver (32C) coupled to the network. The method further includes transmitting a first signal over the link from the first transceiver to the second transceiver at a transmission power level that is sufficiently strong that the signal can be decoded by the second transceiver, but is attenuated sufficiently when it reaches a third transceiver (32E) coupled to the network so that the third transceiver can receive a second signal over the network in the selected frequency band substantially without interference by the first signal.

A system is described for transmitting video signals over various communication media using digital signal processing techniques. An embodiment of the system uses an orthogonal frequency division multiplexing (OFDM) modulation process that enables high-speed data communications of Ethernet and / or MPEG or JPEG or H264 compressed or uncompressed digital video. A second embodiment frequency modulates the OFDM modulated signal (FM-OFDM). The first and second embodiments are implemented with a transmit Ethernet interface, an MPEG or JPEG or H264 compressed or uncompressed digital video capture device, and a modem including a modulator and demodulator that provides communication with several other modem devices along communication media such as power lines, wireless (air), cable, or twisted pairs.

A method for concurrently communicating over each phase of an electrical power distribution network (N). A first outbound signal (SO1) is transmitted over one phase (AN-A) of a bus (S) by an outbound modulation unit. The unit is released as soon as the first outbound signal (SO1) is transmitted so the unit can transmit a second outbound signal (SO2) over a second phase (BN-B or CN-C) of the bus. The second outbound signal is transmitted concurrently with an inbound signal (IB1) sent in response to the first outbound signal (SO1). The unit is again released, as soon as the second outbound signal (SO2) is transmitted, so the unit can transmit a third outbound signal (SO3) over the third phase (BN-B or CN-C) of the bus. This third outbound signal is transmitted concurrently with a second inbound signal (IB2) sent in response to the second outbound signal (SO2). The method allows concurrent communications over all three phases of the network (N).

A system for spread spectrum power line communications employs a harmonic modulation (HM) transmitter coupled to the power line for transmitting message bits to an HM receiver. The spread spectrum accommodates a plurality of HM transmitters simultaneously occupying the same bandwidth. The spectrum of HM, in a frequency range above 60 Hz but below the maximum frequency that will carry through a distribution transformer, is ideal in combating carrier synchronous noise since it can be interleaved with the noise harmonics and therefore be effectively spectrally disjoint with the synchronous noise process spectrum.

An information signal to be communicated to a roof-mounted light bar or other electrical or electronic device travels over the vehicle's or other environment's power bus or other power conductor. In one exemplary illustrative non-limiting implementation, a modulated current load draws power supply current in an amount that is instantaneously responsive to at least some characteristic of the information signal to be communicated. This modulated current loading induces the vehicular or other power supply (e.g., DC battery) to modulate its output voltage in a manner that is responsive to the modulated current loading. A voltage sensor and demodulator also connected to the power bus senses the resulting voltage fluctuations and demodulates those fluctuations to recover or regenerate the original information signal. The recovered information signal may be used for any purpose including but not limited to controlling aspects of the operation of an emergency vehicle light bar or other audible and / or visual warning system or other device. The data sender and data receiver can be co-located to provide a full duplex or half duplex powerline communicated transceiver.

This technology relates to a battery device, a control method, and an electric vehicle capable of providing a highly secure anti-theft function. A battery outputs DC power through a power line, a reader / writer communicates by outputting a high-frequency signal through the power line to read authentication information of an electronic device when the electronic device is connected to the battery through the power line, a microcomputer stores the read authentication information and controls the battery when first connection to the electronic device is performed, and performs an authentication process of the electronic device based on the read authentication information and the authentication information stored in the first connection and controls the battery according to a result of the authentication process of the electronic device when second or subsequent connection to the electronic device is performed. This technology may be applied to the battery device mounted on a power-assisted bicycle, for example.

A bicycle electrical system is provided with a first electric component, a second electric component, and a third electric component. The first electric component includes a first electric power line communication section. The second electric component includes a second electric power line communication section. The third electric component includes a third electric power line communication section. The first and second electric power line communication sections are connected with a first electric power line such that the first and second electric power line communication sections conduct communications via the first electric power line. The second and third electric power line communication sections are connected with a second electric power line such that the second and third electric power line communication sections conduct communications via the second electric power line.

The invention provides a power-line carrier communication apparatus including a transmission unit with a signal point mapping device for mapping a plurality of bit streams produced from transmission data, a wavelet inverse transforming device for modulating the respective sub-carriers by wavelet waveforms which are orthogonal to each other for producing temporal waveform series data, and a D / A converter for converting the temporal waveform series data into an analog temporal waveform series signal; and a reception unit with an A / D converter for obtaining sampling-series waveform data from a power-line communication signal, a wavelet transforming device for wavelet-transforming the sampling-series waveform data into signal point data of the respective sub-carriers, and a symbol judging device for judging bit streams mapped by the signal point mapping device by inverse-mapping a plurality of these signal point data, and for synthesizing the judged bit streams with each other as a reception data series.

Disclosed is a method and apparatus for reducing inbound interference in a broadband powerline communication system. Data modulated on first and second carrier frequencies is received via respective first and second lines of the powerline system. A characteristic of at least one of the carrier signals (e.g., phase or amplitude) is adjusted at the receiver in order to reduce the effects of inbound interference on the transmission system. The adjustment parameters may be determined by adjusting the parameters, during a period of no data transmission, until the output of a differential receiver is zero.

A power line communication device for a vehicle is provided with an internal electronic control unit connected to a connection point on a power line, which communicates with an external electronic control unit by a communication signal superimposed on a supply voltage applied to the power line, and an impedance element inserted between the connection point and an external load. The impedance element suppresses attenuation of the communication signal.

During the communication with a house through an electric power line, a control device determines whether an engine is operating or not. If it is determined that the engine is operating, the control device stops the engine and a motor generator to stop the electric power generation by the motor generator using the output of the engine.

A powerline network system. The system includes a power transformer device at a public utility facility. The system has a powerline box coupled to the transformer device. In a preferred embodiment, the powerline box comprises at least three lines including a first phase, a second phase, and a third phase. The first phase, the second phase, and the third phase are derived from the power transformer device. The system has a powerline coupler coupled to the first phase, the second phase, and the third phase and a multichannel data communication device coupled to the powerline coupler. In a preferred embodiment, the multichannel data communication device includes N channels, whereupon N is an integer greater than 8. The system has a first capacitor and a second capacitor coupled to the first phase and a first length of wiring between the first capacitor and the second capacitor. Preferably, the first length of wire is inductively coupled to one or more power line communication devices. The system has a third capacitor and a fourth capacitor coupled to the second phase and a second length of wiring between the third capacitor and the fourth capacitor. Preferably, the second length of wiring is inductively coupled to one or more power line communication devices. The system has a fifth capacitor and a sixth capacitor coupled to the third phase and a third length of wiring between the fifth capacitor and the sixth capacitor. Preferably, the third length of wiring is inductively coupled to one or more powerline communication devices.

An information signal to be communicated to a roof-mounted light bar or other electrical or electronic device travels over the vehicle's or other environment's power bus or other power conductor. In one exemplary illustrative non-limiting implementation, a modulated current load draws power supply current in an amount that is instantaneously responsive to at least some characteristic of the information signal to be communicated. This modulated current loading induces the vehicular or other power supply (e.g., DC battery) to modulate its output voltage in a manner that is responsive to the modulated current loading. A voltage sensor and demodulator also connected to the power bus senses the resulting voltage fluctuations and demodulates those fluctuations to recover or regenerate the original information signal. The recovered information signal may be used for any purpose including but not limited to controlling aspects of the operation of an emergency vehicle light bar or other audible and / or visual warning system or other device. The data sender and data receiver can be co-located to provide a full duplex or half duplex powerline communicated transceiver.

A communication system includes communication protocols that allow a single network or multiple neighboring networks to increase resource sharing and reduce mutual interference and increase their overall throughput. Various protocols apply to homogenous networks in which all power line communication (PLC) devices of multiple networks are interoperable with respect to full power line communication in a common PHY (specifications, signaling capabilities, modulation scheme, coding scheme, bandwidth, etc.) and to heterogeneous networks in which devices of some PLC networks are not interoperable with PLC devices of other PLC networks with respect to full power line communication given that the devices of the different networks do not employ a common PHY. With respect to heterogeneous networks, a protocol is provided to enable coexistence via a signaling scheme common to all of the devices of the network that allows resource sharing between the devices of the multiple heterogeneous networks. Homogeneous networks are those in which all nodes can communicate with each other using a common PHY, so that information about one PLC network can be transferred to another PLC network. Heterogeneous networks are those in which not all PLC networks can exchange information using their own native PHY, such as where users in different apartments or houses use different devices having different specifications, different signaling capabilities, modulation scheme, coding scheme, bandwidth and the like.

A method for dynamically regulating the power consumption of a high-speed integrated circuit which includes a multiplicity of processing blocks. A first metric and a second metric, which are respectively related to a first performance parameter and a second performance parameter of the integrated circuit, are defined. The first metric is set at a pre-defined value. Selected blocks of the multiplicity of processing blocks are disabled in accordance with a set of pre-determined patterns. The second metric is evaluated, while the disabling operation is being performed, to generate a range of values of the second metric. Each of the values corresponds to the pre-defined value of the first metric. A most desirable value of the second metric is determined from the range of values and is matched to a corresponding pre-determined pattern. The integrated circuit is subsequently operated with selected processing blocks disabled in accordance with the matching pre-determined pattern.

A method and apparatus to efficiently transmit data. The method and apparatus effectively aggregate data and transmit the data in a high-speed power line communication (PLC) network. The method of transmitting the data includes combining each of at least one or more data units transferred from an upper layer, with a field to indicate attribute information of the data unit, dividing the combined data units and fields into frame blocks of an identical size, and aggregating the divided frame blocks and transferring the aggregated frame blocks as one frame to a PHY layer. In this way, data units of a variety of types and sizes transferred from the upper layer are aggregated and transmitted as the one frame.

An apparatus and method is provided for minimizing frequency distortion in the transmit path of an XDSL modem implementing digital multi-tone (DMT) line code. The current invention provides a means for both determining and correcting for distortion in the frequency domain. The apparatus may be incorporated in an existing X-DSL architecture without additional circuitry. In an embodiment of the invention the apparatus may include a calibration phase which may be implemented using the existing analog-to-digital (ADC) conversion and demodulation capabilities on the receive path of the modem. This calibration phase takes place before the training phase associated with establishing communications with a remote site. During the calibration phase a calibration sequence with known spectral characteristics in the frequency domain is injected digitally at the beginning of the transmit path into each of the tone bins of the inverse Fourier Transform engine (IFFT). The receive path is configured to receive feedback of a resultant analog output signal from the transmit path. A frequency analyzer is used to determine the spectral properties of the feedback from the analog output signal and a normalizer is used to compute a local gain table with gain factors for each tone bin which effect the required normalization.

A power line communication system includes: a first electronic instrument and a second electronic instrument, wherein information is received or transmitted between the first electronic instrument and the second electronic instrument which are connected through a communication line using a power line, wherein the first electronic instrument comprises: a key operation unit for accepting a key operation performed by a user; and a transmission unit for transmitting a power-on request signal for requesting the second electronic instrument to be turned on, to the second electronic instrument through the power line based on the key operation in the key operation unit, and the second electronic instrument comprises: a reception unit for receiving the power-on request signal transmitted from the first electronic instrument through the power line; and a power-on control unit for turning on the second electronic instrument based on the power-on request signal received by the reception unit.

In a multicarrier communication using a balanced transmission line such as a power line, a multicarrier communication method operable to select carriers on the basis of an SN-ratio and balancing of the transmission line is provided. Available carriers are selected in accordance with the balancing of the balanced transmission line, in which the balancing is measured at either a sending terminal or a receiving terminal or alternatively at both of them, and the SN-ratio measured between the sending terminal and the receiving terminal. More specifically, any frequency domain having poor balancing and a poor SN-ratio is treated as a non-carrier-employing domain, and consequently the available carriers are selected at other frequency domains. In addition, a modulation method having the greatest permissible multivalue is selected for each of the carriers. The carriers are selected in light of the SN-ratio and balancing, or alternatively in highest-to-lowest order of frequency. Transmission power is controlled for each of the carriers to suppress radiated emission. The SN-ratio and balancing are measured at predetermined time intervals to renew the selection of the carriers and the selection of the modulation methods.